#include<stdio.h>
int main()
{
	char grate;
	scanf_s("%c", &grate);
	printf("Your score:");
	switch (grate)
	{
	case'A':printf("85~100\n");break;
	case'B':printf("70~84\n");break;
	case'C':printf("60~69\n");break;
	case'D':printf("<60\n");break;
	default:printf("enter data error!\n");
	}
	return 0;
}